Escape Sequence in C programming

Certain nonprinting character, as well as the backslash (\) and apostrophe (`), can be expressed in terms of escape sequences. An escape sequence always begins with a backslash and is followed by one or more special characters. For example, a linefeed (LF), this is referred to as a newline in C, can be represented as ln. Such escape sequences always represent single characters, even though they are written in terms of two or more characters. The commonly used escape sequences are listed below:

Character Escape Sequence ASCII Value

bell (alest) \a 007

backspace \b 008

horizontal tab \t 009

vertical tab \v 011

newline (line feed) \n 010

form feed \f 012

carriage return \r 013

quotation mark (”) \” 034

apostrophe (`) \` 039

question mark (?) \? 063

backslash (\) \\ 092

null \0 000

Several character constants are expressed in terms of escape sequences are

‘\n’ ‘\t’ ‘\b’ ‘\’’ ‘\\’ ‘\’’’

The last three escape sequences represent an apostrophe, backslash and a quotation mark respectively.

Escape Sequence ‘\0’ represents the null character (ASCII 000), which is used to indicate the end of a string. The null character constant ‘\0’ is not equivalent to the character constant ‘0’.

The general form ‘\000’ represents an octal digit (0 through 7). The general form of a hexadecimal escape sequence is \xhh, where each h represents a hexadecimal digit (0 through 9 and a through f).

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